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A cistern of capacity 8000 litres mea...

A cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.1 m and its walls are 5 cm thick. The thickness of the bottom is (a) 90 cm       (b) 1 dm      (c) 1 m       (d) 1.1 m

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Considering the thickness of the walls and bottom of the cistern the volume of thecistern=>`(330-10)(260-10)(110-x)=8000xx1000`
`110-x=100`
therefore `x=10cm`
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